Malicious PDF — malware analysis report

Static analysis result for SHA-256 8791310932c30b40…

MALICIOUS

PDF

66.8 KB Created: 2020-12-05 10:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: e090498a7eced0dc50e5eb24b74e2b83 SHA-1: 746ce6d9e15cd36e54fffa3b86a551d959db194c SHA-256: 8791310932c30b408e6f1d21194ccc17d124e7591bff24ae8a0e3caba039c375
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with the primary heuristic identifying it as a malicious redirector and a link farm. The presence of links to external PDF files, including one pointing to a malicious redirector, suggests an attempt to drive traffic to potentially harmful sites. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffine.ru/strik?utm_term=algebra+2+graphing+polynomial+functions+worksheet+answers In PDF document text
    • https://befejabenitegi.weebly.com/uploads/1/3/4/5/134530095/temem_tamazi_jakananawomav_puvonija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391954/normal_5fa3345f40db8.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/bituduxa_pefomaxabom_vapezis_temusinu.pdfIn PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/sinopeputojagi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5fcb37536dece.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387932/normal_5fa3efd66d56f.pdfIn PDF document text
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/nefasad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/68493706851.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/xijovozegum.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/kizewupasenigowavip.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/67945021050.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cdab3398ff75152d912c/t/5fc4f0c43f75b166436ece7b/1606742213757/24247679244.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC586 5948 bytes
SHA-256: 0dc89f7f0f32e7fb2794f3e89ff42dc066fa52d19d2dfc33068530008f818066
font_01_sfnt_off0000d9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BC 10644 bytes
SHA-256: 540eb9e7f71a657d3ed1d60f592fed7833813ab501c1838cb1e2cf4cf8437327

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